Bian Shang was not clear about the situation in Qianyang City, and that's why he risked attacking the Human Cultivators leaving Qianyang City.
It was certainly risky for Bian Shang to do so, but as long as he did not encounter Shen Long, he could still escape. A typical fourth-order Spiritual Fox simply could not track someone so far.
He had also set up a fifth-order Formation, the Eight Gates Silent Spirit Formation, which possessed a strong ability to hide. At first, Shen Long indeed did not discover it, but the Hundred Eyes Cicada found the formation's location, prompting Shen Long to take action.
If it were a different Soul Transformation Cultivator, they might not have been able to find Bian Shang at all.
"Eight Gates Silent Spirit Formation! A formation brought down from the Realm of the Spiritual Pivot!"
Shen Long's face showed delight.